/**
 * Licensed to JumpMind Inc under one or more contributor
 * license agreements.  See the NOTICE file distributed
 * with this work for additional information regarding
 * copyright ownership.  JumpMind Inc licenses this file
 * to you under the GNU General Public License, version 3.0 (GPLv3)
 * (the "License"); you may not use this file except in compliance
 * with the License.
 *
 * You should have received a copy of the GNU General Public License,
 * version 3.0 (GPLv3) along with this library; if not, see
 * <http://www.gnu.org/licenses/>.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.jumpmind.metl.core.util;

import java.io.InputStream;
import java.net.URL;
import java.net.URLClassLoader;

public class ChildFirstURLClassLoader extends URLClassLoader {

    private ClassLoader realParent;

    public ChildFirstURLClassLoader(URL classpath, ClassLoader parent) {
        this(new URL[] { classpath }, parent);
    }

    public ChildFirstURLClassLoader(URL[] classpath, ClassLoader parent) {
        super(classpath, null);
        this.realParent = parent;
    }

    @Override
    protected Class<?> findClass(String name) throws ClassNotFoundException {
        Class<?> loaded = super.findLoadedClass(name);
        if (loaded == null) {
            try {
                loaded = super.findClass(name);
            } catch (ClassNotFoundException e) {
                loaded = realParent.loadClass(name);
            }
        }
        return loaded;
    }
    
    @Override
    public URL getResource(String name) {
        URL url = super.getResource(name);
        if (url == null) {
            url = realParent.getResource(name);
        }
        return url;
    }
    
    @Override
    public InputStream getResourceAsStream(String name) {
        InputStream is = super.getResourceAsStream(name);
        if (is == null) {
            is = realParent.getResourceAsStream(name);
        }
        return is;
    }

}